Korean Journal of Fisheries and Aquatic Sciences (한국수산과학회지)

The Korean Society of Fisheries and Aquatic Science (한국수산과학회)
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Oceanic Characteristics of Fishing Ground for Yellowfin and Bigeye Tunas Caught by Korean Tuna Longline Fishery in the Tropical Pacific

열대 태평양 연승어업 대상 황다랑어와 눈다랑어 어장 분포의 해황 특성

  • YANG Won Seok (Distance Water Fisheries Resources Division, National Fisheries Research and, Development Institute) ;
  • CHO Kyu Dae (Department of Oceanography, Pukyong National University) ;
  • MOON Dae Yeon (Distance Water Fisheries Resources Division, National Fisheries Research and, Development Institute) ;
  • KOH Jeong Rack (Distance Water Fisheries Resources Division, National Fisheries Research and, Development Institute)
  • 양원석 (국립수산과학원 해외자원팀) ;
  • 조규대 (부경대학교 해양학과) ;
  • 문대연 (국립수산과학원 해외자원팀) ;
  • 고정락 (국립수산과학원 해외자원팀)
  • Published : 2005.06.01
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Abstract

The horizontal and vertical distribution of yellowfin tuna, Thunnus albacares (Bonnaterre) and bigeye tuna, Tunnus obesus (Lowe) in relation to oceanic conditions such as thermal structure produced during El Nino/La Nina episodes were analyzed on the basis of data sets for the catches and efforts from the Korean tuna longline fishery and for the oceanographic observations from the NOAA during 1982-2002 in the tropical Pacific. The high density of fishing ground appeared in the western Pacific ($5^{\circ}N-5^{\circ}S,\;160^{\circ}E-180^{\circ}W$) for yellowfin tuna and in the eastern Pacific ($5^{\circ}N-15^{\circ}S,\;130^{\circ}W-100^{\circ}W$) for bigeye tuna. yellowfin and bigeye tunas were mainly distributed at the 110-250 m layer and 245-312 m layer, respectively, in the western Pacific. However, in the eastern Pacific, they were mostly caught at the 116-161 m and 205-276 m layer for yellowfin tuna and bigeye tuna, respectively. It can be suggested that bigeye tuna be distributed in the deepest layer among tunas and show a vertical size stratification. It was observed that during the El Nino events the main fishing ground of yellowfin tuna shifted from the western Pacific toward the eastern Pacific. In the eastern Pacific which showed a higher density of bigeye tuna, the vulnerability of bigeye tuna caught by deep longline increased during the El Nino events due to deepening of thermocline layer and a more intensively distribution of the fish schools in the lower layer of thermocline during the El Nino events.

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References

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